Irish lichens

Caloplaca decipiens
Order: Teloschistales       Family: Teloschistaceae

Species: Caloplaca decipiens

Growth type placodioid.
Photos: On city centre wall. Dublin, Ireland.
Identification confirmed by Alan Silverside (from photographs)

Small light-yellow to brownish-orange thallus, centre darker, often disintegrates. Long convex, +/- distinct lobes with palmate tips, inner lobes with granular orange-yellow soredia.
K+ crimson / purple.

Occurs on mortar, tombstones and nutrient-rich limestone.

Caloplaca decipiens

Caloplaca decipiens
Caloplaca decipiens on wall in Dublin. January 2009

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